Re: Ofeq-5

From: Petter Aslaksen (fluorgutten@googlemail.com)
Date: Sun Dec 16 2012 - 12:25:09 UTC

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    Thank you for your reply, trying to get my head around it, it needs a
    little maturation and contemplation
    
    I am stuck with my 18-200mm, 3.5-5.6f at the moment, however I will bring
    my 50mm next time, I bought it for indoor photos of family parties. Never
    thought it might be my most valuable lens for finding classified satellites!
    
    In Norway however, this one is never visible... so I guess I will have some
    other satellites to look for there.
    
    Thanks again!
    
    On Sun, Dec 16, 2012 at 12:30 PM, C. Bassa <cgbsat@gmail.com> wrote:
    
    > Hi Petter,
    >
    > On 16/12/12 06:39, Petter Aslaksen wrote:
    > > I see the elsets are old. Any suggestions on what to do? Picking up a
    > > retrograde satellite with my shotgun photograpy approach should be
    > > feasible, right?
    >
    > It is certainly feasible! It depends on how wide your field of view is
    > and how sensitive your camera and lens are. In an earlier post you
    > mentioned owning a 50mm F/1.4; this would be a good lens to use as it is
    > both very sensitive and has a large field of view.
    >
    > As for finding Ofeq-5, this satellite has not been seen for 630 days so
    > the orbital elements will no longer be accurate (both because of drag,
    > but also because of possible maneuvers). To find Ofeq-5 you will have to
    > perform a planar search. See
    > http://www.satobs.org/seesat/Jun-2005/0205.html for an explanation.
    >
    > To illustrate that post, here are 5 plots showing the movement of the
    > Ofeq 5 plane from your location at 31.7361N, 6.0422E for yesterday evening.
    > http://dl.dropbox.com/u/52579487/1700.png
    > http://dl.dropbox.com/u/52579487/1730.png
    > http://dl.dropbox.com/u/52579487/1800.png
    > http://dl.dropbox.com/u/52579487/1830.png
    > http://dl.dropbox.com/u/52579487/1900.png
    >
    > Each of the numbered yellow/gray lines is prediction for an object in
    > the Ofeq 5 plane but with a different mean anomaly (the number indicates
    > the mean anomaly). The length of the line indicates the movement of that
    > object over the next 60s. When the line is yellow the object is
    > illuminated by the Sun; gray lines indicate they are in the shadow of
    > the Earth and hence not visible.
    >
    > To preform a planar search you will have to track the illuminated part
    > of the plane. Depending on the field of view you may have to reposition
    > your camera as often as every 10 or 15 minutes.
    >
    > I hope these suggestions make sense.
    >
    > Regards,
    >     Cees
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    -- 
     **
    *Petter*
    *31.7361N, 6.0422E / 63.4303N, 10.4525E*
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